Quote:
Originally Posted by ImWired
I think the problem of getting headers to fit may be that the supreme 442's came with dual exhaust and the cross overs would have been notched for this and the others are not.
ImWired
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Nope. Prior to 1975 (when federally mandated catalytic converters forced all cars to have single exhaust), ALL GM crossmembers were notched for dual exhaust. THERE IS NO "HEADER ISSUE" with Supremes or convertibles, just misinformation.